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Finding the Fourth Proportional to 259.99, 390.02 and 77.40

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Solution

The fourth proportional to 259.99, 390.02 and 77.40 is: 116.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    259.99 : 390.02 = 77.40 : x
  2. Step 2: Convert to fraction form
    259.99/390.02 = 77.40/x
  3. Step 3: Cross multiply
    259.99x = 390.02 × 77.40
  4. Step 4: Simplify right side
    259.99x = 30,187.16
  5. Step 5: Solve for x
    x = 30,187.16/259.99
  6. Step 6: Final answer
    x = 116.11

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.